Alright I could not hear any sneezing or wheezing now I got what you are getting at and the volume on your you tube is low or nothing at all,,,,, if you can get any Apple Cider Vinegar and add a little bit of that to the water and another trick is to cook up an egg a day for your girls and you should notice a difference in a week or so ......

Funny there are only a few reasons a chicken will start sneezing one is a new chicken added to the flock that brought a new dieses with it or wind and smoke and being rained on and getting cold dust or sand in the air ..... It is not something that just starts from nowhere ....

So can you get any Apple Cider Vinegar to add to the water for your chickens .....